8.7-W average power, in-band pumped femtosecond Ho:CALGO laser at 2.1 um

TL;DR

This paper reports a record-high 8.7 W average power femtosecond Ho:CALGO laser at 2.1 um, demonstrating its potential for high-power applications in the 2-3 um wavelength region.

Contribution

It presents the highest average power and pulse energy achieved from a mode-locked bulk laser in the 2-3 um range using Ho:CALGO, with detailed performance metrics.

Findings

Achieved 8.7 W average power with 369 fs pulses

Demonstrated 38.2% optical-to-optical efficiency

Pulse energy of 103 nJ and peak power of 246 kW

Abstract

We report on an in-band pumped SESAM mode-locked Ho:CALGO bulk laser with a record-high average power of 8.7 W and an optical-to-optical efficiency of 38.2% at a central wavelength of 2.1 um. At this power level, the bulk laser generates pulses with a duration of 369 fs at 84.4-MHz repetition rate, corresponding to a pulse energy of 103 nJ and a peak power of 246 kW. To the best of our knowledge, this is the highest average power and pulse energy directly generated from a mode-locked bulk laser in the 2-3 um wavelength region. Our current results indicate that Ho:CALGO is a competitive candidate for average power scaling of 2 um femtosecond lasers.